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/********************* */
/*! \file proof_node_algorithm.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds, Haniel Barbosa, Gereon Kremer
** This file is part of the CVC4 project.
** Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
** in the top-level source directory and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief Proof node algorithm utilities.
**/
#include "cvc4_private.h"
#ifndef CVC4__EXPR__PROOF_NODE_ALGORITHM_H
#define CVC4__EXPR__PROOF_NODE_ALGORITHM_H
#include <vector>
#include "expr/node.h"
namespace CVC4 {
class ProofNode;
namespace expr {
/**
* This adds to the vector assump all formulas that are "free assumptions" of
* the proof whose root is ProofNode pn. A free assumption is a formula F
* that is an argument (in d_args) of a ProofNode whose kind is ASSUME, and
* that proof node is not beneath an application of SCOPE containing F as an
* argument.
*
* This traverses the structure of the dag represented by this ProofNode.
* Its implementation is analogous to expr::getFreeVariables.
*
* @param pn The proof node.
* @param assump The vector to add the free asumptions of pn to.
*/
void getFreeAssumptions(ProofNode* pn, std::vector<Node>& assump);
/**
* Same as above, but maps assumptions to the proof pointer(s) for that
* assumption. Notice that depending on how pn is constructed, there may be
* multiple ProofNode that are ASSUME proofs of the same assumption, which
* are each added to the range of the assumption.
*
* @param pn The proof node.
* @param amap The mapping to add the free asumptions of pn and their
* corresponding proof nodes to.
*/
void getFreeAssumptionsMap(
std::shared_ptr<ProofNode> pn,
std::map<Node, std::vector<std::shared_ptr<ProofNode>>>& amap);
/**
* @return true if pn contains pnc.
*/
bool containsSubproof(ProofNode* pn, ProofNode* pnc);
/**
* Same as above, with a visited cache.
*
* @return true if pn contains pnc.
*/
bool containsSubproof(ProofNode* pn,
ProofNode* pnc,
std::unordered_set<const ProofNode*>& visited);
} // namespace expr
} // namespace CVC4
#endif /* CVC4__EXPR__PROOF_NODE_ALGORITHM_H */
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